Uplink Positioning Reference Signals for RIS Measurement Prioritization
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Solution Overview
Problem
Existing wireless communication systems, particularly in 5G networks, face challenges in enhancing spectral efficiency, reducing latency, and improving signaling efficiency for accurate mobile device positioning, especially with the introduction of reconfigurable intelligent surfaces (RISs) that complicate signal measurements.
Innovation Solution
The use of differentiated signal types, including RIS-reflected and non-RIS-reflected signals, with specific transmission characteristics, and UE capabilities to prioritize and report higher-quality measurements, along with on-demand PRS requests and power control techniques to optimize positioning accuracy and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If RIS-reflected signals are used for positioning, then coverage is improved, but measurement accuracy deteriorates due to signal quality degradation
Solution Approach 1:
The patent segments positioning reference signals into two distinct types: RIS-reflected PRS and non-RIS-reflected PRS. This segmentation allows the system to separately handle and measure signals based on their reflection path, enabling the UE to prioritize higher-quality measurements while still utilizing RIS-reflected signals for extended coverage areas.
Solution Approach 2:
The patent changes the measurement parameters by introducing separate measurement configurations for RIS-reflected and non-RIS-reflected signals. This includes different quality thresholds, measurement priorities, and reporting criteria, allowing the system to optimize positioning accuracy by selectively processing signals based on their specific characteristics.
2Measurement precision
If multiple signal types are measured, then positioning accuracy is improved, but signaling complexity increases
Solution Approach 1:
The patent segments the positioning reference signal measurements into distinct categories (RIS-reflected and non-RIS-reflected), each with its own measurement configuration and reporting requirements. This structured segmentation organizes the complexity into manageable components rather than treating all measurements uniformly.
Solution Approach 2:
The patent implements dynamic measurement prioritization where the UE can adaptively select which signal type to measure and report based on current signal conditions and quality thresholds. This dynamic approach reduces signaling overhead by only reporting measurements that meet specific criteria rather than reporting all measurements universally.
3Measurement precision
If all PRS measurements are reported, then positioning accuracy is improved, but latency increases due to processing overhead
Solution Approach 1:
The patent applies partial action by requiring the UE to report only the most relevant PRS measurements that meet quality thresholds, rather than reporting all measurements. This selective reporting reduces processing overhead and latency while still providing sufficient data for accurate positioning.
Solution Approach 2:
The patent implements dynamic measurement reporting where the UE adaptively selects which measurements to report based on current signal conditions and quality criteria. This dynamic filtering reduces the volume of data that needs to be processed and transmitted, thereby reducing positioning latency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances measurement accuracy and reduces positioning latency by prioritizing higher-quality signal measurements and optimizing resource allocation, thereby improving the overall efficiency and effectiveness of mobile device location determination.
Implementation Method 1
reconfigurable intelligent surfaces (RISs) are used to assist the base station (BS) to localize the user equipment (UE) in the mm-wave MIMO systems, where the reference signals sent by the UE are measured by the BS and the information of the direct UE-BS path and the reflection paths via RISs are utilized in the localization
Data Source
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AI summary
A positioning reference signal provision method includes: transmitting, from a UE directly to a telecommunication device other than a repeater, a first UL-PRS of a first type of UL-PRS; and transmitting, from the UE to a RIS, a second UL-PRS of a second type of UL-PRS.